61961043877 has 4 divisors (see below), whose sum is σ = 62042465196. Its totient is φ = 61879622560.

The previous prime is 61961043871. The next prime is 61961043931. The reversal of 61961043877 is 77834016916.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10905833761 + 51055210116 = 104431^2 + 225954^2 .

It is a cyclic number.

It is not a de Polignac number, because 61961043877 - 2³¹ = 59813560229 is a prime.

It is a super-2 number, since 2×61961043877² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61961043871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40709518 + ... + 40711039.

It is an arithmetic number, because the mean of its divisors is an integer number (15510616299).

Almost surely, 2^61961043877 is an apocalyptic number.

It is an amenable number.

61961043877 is a deficient number, since it is larger than the sum of its proper divisors (81421319).

61961043877 is an equidigital number, since it uses as much as digits as its factorization.

61961043877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81421318.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 61961043877 in words is "sixty-one billion, nine hundred sixty-one million, forty-three thousand, eight hundred seventy-seven".